338 research outputs found
NJL Model at Finite Chemical Potential in a Constant Magnetic Field
We investigate the influence of an external magnetic field on chiral symmetry
breaking in the Nambu-Jona-Lasinio (NJL) model at finite temperature and
chemical potential. According to the Fock-Schwinger proper-time method, we
calculate the effective potential in the leading order of the
expansion. The phase boundary dividing the symmetric phase and the broken phase
is illustrated numerically. A complex behavior of the phase boundary is found
for large chemical potential.Comment: 6 pages, 2 figures, Poster talk presented at the Workshop on Finite
Density QCD at Nara, Japan, 10-12 July 2003; replaced two reference
Four-fermion Interaction Model in a Constant Magnetic Field at Finite Temperature and Chemical Potential
We investigate an influence of an external magnetic field on chiral symmetry
breaking in a four-fermion interaction model at finite temperature and chemical
potential. By using the Fock-Schwinger proper-time method, we calculate the
effective potential for the four-fermion interaction model at the leading order
of the expansion. A phase structure of the chiral symmetry breaking is
shown on -, - and - planes. The external magnetic field
modifies the phase structure. It is found that a new phase appears for a large
chemical potential.Comment: 16 pages, 10 figure
Quasinormal mode spectrum of the AdS black hole with the Robin boundary condition
We study the quasinormal mode (QNM) spectrum of an asymptotically AdS black
hole with the Robin boundary condition at infinity. We consider the
Schwarzshild-AdS with the flat event horizon as the background spacetime
and study its scalar field perturbation. Denoting leading coefficients of slow-
and fast-decay modes of the scalar field at infinity as and ,
respectively, we assume a linear relation between them as , where is a constant called the Robin parameter
and periodic under . In a certain range of the Robin
parameter, there is an instability driven by the boundary condition. We also
find the holonomy in the QNM spectrum under the parametric cycle of the
boundary condition: . After the one-cycle, -th overtone of
the QNM moves to -th overtone. The fundamental tone of the QNM is swept
out to the infinity in the complex plane.Comment: 20 pages, 8 figure
Makespan Minimization of Machines and Automated Guided Vehicles Schedule Using Binary Particle Swarm Optimization
An efficient and optimized Automated Guided
Vehicles (AGVs) operation plays a critical role in improving the performance of a Flexible Manufacturing System (FMS). Among the main elements in the implementation of AGV is task scheduling. This is due to the fact that efficient scheduling would enable the increment of productivity and reducing delivery cost whilst optimally utilizes the entire fleet. In this research, Binary Particle Swarm Optimization (BPSO) is used to optimize simultaneous machines and AGVs scheduling process with makespan minimization function. It is proven that the method is capable to provide better solution compared to others
Anti-inflammatory effects of hyaluronan in arthritis therapy: Not just for viscosity
Hyaluronic acid (HA) has been widely used for viscosupplementation of diseased or aged articular joints. However, recent investigations have revealed the active anti-inflammatory or chondroprotective effect of HA, suggesting its potential role in attenuation of joint damage. In particular, interactions between HA and other inflammatory mediators are attracting interest. This review summarizes several aspects of recent investigations of the anti-inflammatory effects of HA in arthritis
Prostaglandin E2 regulates the expression of connective tissue growth factor (CTGF/CCN2) in human osteoarthritic chondrocytes via the EP4 receptor
Effect of Chondroitin Sulfate on the Biodegradation and Drug Release of Chitosan Gel Beads in Subcutaneous Air Pouches of Mice
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